diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index fd6001a0..e4b5ecf0 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -1,6 +1,6 @@
 name: test
 
-on: [push, pull_request]
+on: [push, pull_request, workflow_dispatch]
 
 jobs:
   test:
@@ -21,6 +21,15 @@ jobs:
     - name: Install dependencies
       run: pip install .[dev]
 
+    # required only if you want to verify C# with SourceExpander
+    - uses: actions/setup-dotnet@v1
+      with:
+        dotnet-version: |
+          3.1.x
+          6.0.x
+    - name: Install dependencies (C#)
+      run: dotnet tool install -g SourceExpander.Console
+
     - name: Run tests
       run: |
         unset GITHUB_ACTION